Polycarbonate Resin Composition with Phosphate Ester
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Solution Overview
Problem
Polycarbonate resin compositions face challenges in maintaining impact strength, chemical resistance, and flowability while avoiding weld strength deterioration, heat resistance loss, and aesthetic issues when mixed with other polymers, particularly in applications like portable electronic devices and heat-emitting products.
Innovation Solution
A polymer composition comprising a polycarbonate resin, syndiotactic polystyrene resin, core-shell graft copolymer, and phosphate ester compound, with specific weight ratios, enhancing physical and chemical properties such as impact strength, chemical resistance, and flowability, while maintaining aesthetic appeal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If other polymers are mixed with polycarbonate resin to enhance chemical resistance and impact resistance, then chemical resistance and impact resistance are improved, but weld strength deteriorates, heat resistance is lost, and aesthetic appeal is reduced
Solution Approach 1:
The patent changes the chemical composition parameters by introducing a specific phosphate ester compound (Formula II) with controlled molecular structure and composition. This compound modifies the polycarbonate resin's chemical resistance properties without compromising weld strength or heat resistance, resolving the contradiction between chemical resistance improvement and strength maintenance
Solution Approach 2:
The patent creates a composite material system consisting of polycarbonate resin combined with a specifically structured phosphate ester compound. This composite approach enhances chemical resistance while maintaining the base polymer's strength and heat resistance properties, avoiding the deterioration issues seen with conventional polymer blends
2Strength
If other polymers are mixed with polycarbonate resin to enhance impact resistance, then impact resistance is improved, but heat resistance is lost
Solution Approach 1:
The patent modifies the resin composition by incorporating a phosphate ester compound with specific molecular parameters (Formula II structure). This parameter change enhances impact resistance through controlled molecular interaction while preserving the thermal stability and heat resistance of the polycarbonate base resin
3Reliability
If other polymers are mixed with polycarbonate resin to improve chemical resistance, then chemical resistance is improved, but aesthetic appeal is lost
Solution Approach 1:
The patent uses a phosphate ester compound with controlled molecular parameters (Formula II) that provides chemical resistance enhancement while maintaining aesthetic appearance. The specific structural parameters of the additive ensure compatibility with the polycarbonate matrix, preventing visual defects like discoloration or surface degradation
4Strength
If large amounts of other polymers are added to affect positive change in impact resistance, then impact resistance is improved, but composition complexity and manufacturing difficulty increase
Solution Approach 1:
The patent extracts the essential function of polymer blending (impact resistance enhancement) and achieves it through a single, specifically structured phosphate ester compound rather than complex multi-polymer blends. This simplifies the composition while maintaining the desired impact resistance improvement
Solution Approach 2:
The patent achieves impact resistance improvement through controlled parameter changes in the additive's molecular structure (Formula II phosphate ester) rather than through large quantities of mixed polymers. This approach reduces composition complexity while effectively improving impact resistance
Data Source
AI summary
A polymer composition includes a polycarbonate resin, a syndiotactic polystyrene resin, a core-shell graft copolymer, and a phosphate ester compound. In some embodiments, the compositions have one or more of good impact strength, Falling Dart impact strength, chemical resistance, and flowability.